That and misprision of treason, and arguably it's not just misprision, but treason itself.
A few years in jail for perjury is bad enough, but traitors are subject to hanging.
Good reason to be very careful about what one says or doesn't say.
Or to turn state's evidence...
This brings up a salient point, and one I can't recall having seen addressed as yet:
Will Nancy Peolosi issue/sign two different versions of the DNC nomination letter this time around?